Harman US

Eureka, IL Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Eureka, a city in Woodford County, Illinois.

Today
86°F
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 11am, then a slight chance of showers and thunderstorms between 11am and 1pm. Mostly cloudy, with a high near 86. Southeast wind around 7 mph. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch possible.

7-day forecast for Eureka

WhenTempForecastWindPrecip
Today 86°F Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms 7 mph SE 29%
Tonight 68°F Showers And Thunderstorms Likely 6 mph WNW 62%
Sunday 74°F Showers And Thunderstorms Likely 5 to 15 mph N 70%
Sunday Night 57°F Showers And Thunderstorms Likely then Chance Showers And Thunderstorms 16 mph NE 56%
Monday 65°F Showers And Thunderstorms Likely 17 mph ENE 64%
Monday Night 52°F Chance Rain Showers 12 to 17 mph NE 46%
Tuesday 64°F Slight Chance Rain Showers 15 mph NE 19%
Tuesday Night 50°F Slight Chance Rain Showers then Partly Cloudy 7 to 15 mph NNE 15%
Wednesday 67°F Mostly Sunny 12 mph NNE 4%
Wednesday Night 52°F Partly Cloudy 5 to 10 mph NNE 2%
Thursday 69°F Mostly Sunny 6 to 9 mph NNE 2%
Thursday Night 53°F Partly Cloudy 3 to 8 mph NE 2%
Friday 72°F Mostly Sunny 5 to 9 mph NE 3%
Friday Night 53°F Partly Cloudy 3 to 7 mph ENE 3%

Forecast source: National Weather Service (api.weather.gov) for Eureka (40.714, -89.277). Updated through the day.

Growing snapshot for Eureka

Last spring frost
Apr 21
First fall frost
Oct 17
Growing season
178 days
Hardiness zone
5b

More local growing data for Eureka: nearby ZIP 61530 weather · frost dates · planting calendar · Illinois frost dates

Nearby towns & communities

All Illinois locations ›

Climate data from the nearest NOAA station, Congerville 2Nw, Il (6.2 mi from Eureka). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.